What's in the Box* Maxim Defense MDX:508 300 Blackout Semi-Auto Pistol* Cable Lock* Owner's ManualThe PDX redefined compact firepower in size, durability, and accuracy. With the same heart and soul of the proven PDX, the 508 features an 8.5” barrel, ideal for when maximum concealment and compactness are essential but not as crucial.The 8.5” barrel delivers higher velocities while the CQB system plays a key role in the compact size. The CQB brace adds a mere 5.375” to the end of the receiver with a full extension of 10”, providing complete comfort to the operator.